Method for mass-spectroscopic examination of a gas mixture and m

Details Method for mass-spectroscopic examination of a gas mixture and m Method for mass-spectroscopic examination of a gas mixture and m

1988-12-16

1991-07-02

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250291, 250292, H01J 4942

Patent

active

050287770

ABSTRACT:
For mass-spectroscopic examinations of gas mixtures a mass spectrometer is used which comprises a quistor in which ions of the gas mixture whose charge-to-mass ratio is located in a predetermined range are stored by generating an electromagnetic field. By varying the field parameters, the ions are forced successively to leave the ion trap. The intensity of the ion flow leaving the ion trap is measured as a function of the variation of the field parameters. For improving the resolution, one uses a quistor of the type where the distance-related ratio Q of the radii of the inscribed vertex circles of the electrodes comply with the condition Q.ltoreq.3.990, wherein ##EQU1## R.sub.e being the radius of the cross-section of the vertex of the end electrodes (3,5);

REFERENCES:
patent: 3527939 (1970-09-01), Dawson
patent: 4540884 (1985-09-01), Stafford et al.
patent: 4650999 (1987-03-01), Fies et al.
patent: 4882484 (1989-11-01), Franzen et al.
"Zeitschrift fur angewandte Physik", Rettinghaus, Z. Angrew Phys., 1967, pp. 321-326.

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